San Diego may become the fourth city in the county to ban Styrofoam food and beverage containers.

A proposal announced Thursday by San Diego city Councilman Chris Ward would stop restaurants from using polystyrene, more commonly known as Styrofoam, and would also ban the sale of the material in the city.

“It’s time San Diego joins over a hundred cities throughout California that have already banned these harmful environmental pollutants and moves forward toward a more sustainable future,” Ward said in a statement.

Just last year, the San Diego City Council decided not to ban Styrofoam, but instead begin a recycling program for the material.